Piano teaching aid



FIG. 1 is a top, front, left-side perspective view of a piano teaching aid embodying my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines at the tail of the piano teaching aid, and the unshaded surfaces within the broken lines at the tail, indicate that any portion of the article between the broken line areas forms no part of the claimed design. The broken line features along the tongue feature of the piano teaching aid depict features of the article that form no part of the claimed design. 

CLAIM The ornamental design for a piano teaching aid, as shown and described. 